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Web Ontology Language – OWL

  • OWL: acronym for Web Ontology Language, more easily pronounced than WOL
  • family of languages for authoring ontologies
  • since 2004, OWL 2.0 since 2009     
  • Semantic fragment of FOL


  • Instantiation of classes by individuals
  • Concept hierarchies (taxonomies, inheritance): classes, terms
  • Binary relations between individuals: Properties, Roles
  • Properties of relations (e.g., range, transitive)
  • Data types (e.g. Numbers): concrete domains
  • Logical means expression
  • Clear semantics!

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